# What are the 7 triangles?

## What are the 7 triangles?

To learn about and construct the seven types of triangles that exist in the world: equilateral, right isosceles, obtuse isosceles, acute isosceles, right scalene, obtuse scalene, and acute scalene.

### Who gave Heron’s formula?

Heron of Alexandria

Who discovered area in math?

In 499 Aryabhata, a great mathematician-astronomer from the classical age of Indian mathematics and Indian astronomy, expressed the area of a triangle as one-half the base times the height in the Aryabhatiya (section 2.6). A formula equivalent to Heron’s was discovered by the Chinese independently of the Greeks.

What is s in geometry?

Symbols Meaning of the symbols π Ratio of circumference to diameter of a circle. s Usually Length of a side. b length of a base. A Area. h height of a figure.

## What do you mean by Heron’s formula?

In geometry, Heron’s formula (sometimes called Hero’s formula), named after Hero of Alexandria, gives the area of a triangle when the length of all three sides are known.

### What is an area formula?

L is the length, W is the width and H is the height. A is the area of the base, h is the height….Perimeter, Area, and Volume.

Table 2. Area Formulas
Shape Formula Variables
Triangle A=√s(s−a)(s−b)(s−c)where s=a + b + c2 a , b , and c are the side lengths and s is the semiperimeter

Do you find area?

To find the area of a rectangle, multiply its height by its width. For a square you only need to find the length of one of the sides (as each side is the same length) and then multiply this by itself to find the area.

How do you find area with 3 sides?

The area of a triangle is defined as the total region that is enclosed by the three sides of any particular triangle. Basically, it is equal to half of the base times height, i.e. A = 1/2 × b × h. Hence, to find the area of a tri-sided polygon, we have to know the base (b) and height (h) of it.

## What is S in area of triangle?

There are several ways to compute the area of a triangle. Another is Heron’s formula which gives the area in terms of the three sides of the triangle, specifically, as the square root of the product s(s – a)(s – b)(s – c) where s is the semiperimeter of the triangle, that is, s = (a + b + c)/2.

### What is a formula of perimeter of triangle?

The perimeter of a triangle is the sum of all its three sides. We can work out the perimeter using the following formula: Perimeter of a triangle = sum of all three sides. If a, b and c are the sides of the triangle, then. Perimeter of triangle = a + b + c.

How do you find the area when all sides are different?

How to use irregular area calculator?

1. Step 1: Measure all sides of the area in one unit (Feet, Meter, Inches or any other).
2. Step 2: Enter length of horizontal sides into Length 1 and Length 2. And Width of the vertical sides into Width 1 and Width 2.
3. Step 3: Press calculate button.
4. Our Formula: Area = b × h.

How do you find area with 4 sides?

Use the following equation: Area = side × side or A = s. Example: If one side of a square has a length of 4 feet, (t = 4), then the area of this square is simply t2, or 4 x 4 = 16 square feet.

## What shape has 4 sides with different lengths?

Rectangle: Four internal right angles, opposite sides of equal length. Parallelogram: Opposite sides are parallel, opposite sides are equal in length, opposite angles are equal.

### What has 4 equal sides but no right angles?

A rhombus is defined as a parallelogram with four equal sides. Is a rhombus always a rectangle? No, because a rhombus does not have to have 4 right angles. Kites have two pairs of adjacent sides that are equal.

What is a 10 sided shape?

decagon

What is a 9 sided shape called?

nonagon

## What is a 10000 sided shape called?

Myriagon

### What do you call a 12 sided shape?

A dodecagon is a 12-sided polygon.

What is 11 sided shape called?

Hendecagon

What is a 100 sided shape?

Hectogon

## What is 13 sided shape called?

triskaidecagon

### What do you call an 18 sided shape?

An 18-sided polygon, sometimes also called an octakaidecagon.

What do you call a 69 sided shape?

Tejan Gupta answered this. Dear studebt, For such large number of sides we call them simply 69-gon and 96-gon.

What is an 18 Gon?

In geometry, an octadecagon (or octakaidecagon) or 18-gon is an eighteen-sided polygon.

## How many triangles are in a 18 Gon?

N Triangles with 3 diagonal endpoints Total Number of Triangles
16 560 37424
17 680 53516
18 816 73404
19 969 101745